This PV mounting bolt stands out with its high-strength carbon steel base material and hot-dip galvanized surface finish, which provides superior corrosion resistance compared to basic painted bolts. The hexagon socket drive design ensures tight fastening without slipping during installation, while the metric coarse thread guarantees stable engagement with pre-drilled holes in solar brackets. It undergoes strict quality inspection including tensile strength testing and hardness verification, ensuring it can withstand the dynamic loads caused by wind, snow and panel weight over the service life of the solar system. Unlike generic fasteners, this bolt is specifically optimized for solar mounting applications, with diameter and length ranges tailored to fit most standard solar rail and bracket configurations, eliminating the need for custom machining for most projects. It also offers consistent dimensional accuracy, ensuring that each bolt can be installed smoothly without fit issues, reducing on-site rework and improving overall installation efficiency.
The bolt follows ISO 4017 international standard, with the main material being carbon steel Q235, which boasts good ductility and basic mechanical properties suitable for general solar mounting scenarios. The strength grade is 4.8, with a minimum tensile strength of 400MPa and a yield strength of 320MPa, meeting the basic load-bearing requirements for residential and small commercial solar projects. The surface finish adopts hot-dip galvanized treatment, with a coating thickness controlled between 85μm and 120μm, providing 500+ hours of salt spray corrosion resistance to withstand outdoor weathering. The thread type is metric coarse thread, with pitch ranging from 1mm to 1.75mm based on different nominal diameters. The drive type is hexagon socket, compatible with standard 4mm, 5mm and 6mm Allen wrenches for easy installation. The diameter range covers M6 to M12, with nominal diameters from 6mm to 12mm, and the length range is 20mm to 100mm, available in 5mm incremental length options to fit various mounting bracket thicknesses. The head style is standard hexagonal head, with a width across flats matching the corresponding wrench size, and the hardness is controlled between HV 120 and 150 to balance ductility and structural strength.
This hot-dip galvanized carbon steel PV mounting bolt is primarily designed for residential rooftop solar panel mounting systems, small commercial ground-mounted solar farms, and solar carport installations. It is suitable for fastening aluminum solar rails, steel brackets and panel mounting frames to rooftop substrates such as concrete, asphalt shingles or metal roofs, as well as ground mounting piles made of steel or concrete. It performs well in both temperate and coastal areas, as the hot-dip galvanized coating provides reliable protection against salt spray, moisture and UV radiation in harsh outdoor environments. Installation is straightforward, requiring only a standard Allen wrench and a power drill for pre-drilling holes, making it ideal for both professional solar installation teams and DIY solar project enthusiasts. It is compatible with most mainstream solar mounting kit brands, ensuring seamless integration without additional modification, and can be stored in standard fastener containers for easy transportation and inventory management.
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